Dr. John C. Greenawalt, MD
- Medicare services, 2024
- 155
- Medicare patients, 2024
- 76
- Part D claims, 2024
- 31
- Hospital affiliations
- 1
- Industry payments
- $2,925
- Practice address
- 6701 North Charles Street, Baltimore, MD 21204
- Practice phone
- Call (443) 849-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Greenawalt's professional email, personal email and mobile number
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Dr. John C. Greenawalt is an internist in Towson, Maryland
Dr. Greenawalt practices at Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare.
Dr. Greenawalt's NPI, 1699783795, was assigned on August 4, 2006. Dr. Greenawalt holds Maryland license D60248.
- NPI
- 1699783795NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0749305118
- NPI enumeration date
- August 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (443) 849-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John C. Greenawalt practices at Greater Baltimore Medical Center in Baltimore, Maryland
Dr. Greenawalt's primary practice is Greater Baltimore Medical Center, at 6701 North Charles Street, Baltimore, MD 21204 in Baltimore County. The practice phone is (443) 849-2000.
- Greater Baltimore Medical Center6701 North Charles Street, Baltimore, MD 21204 · Baltimore CountyPhone(443) 849-2000
Source: Dmand AI Affiliation Data
Dr. John C. Greenawalt is affiliated with 1 site of care and 1 medical group
Dr. Greenawalt's primary practice is Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare. The medical group on file is Greater Baltimore Medical Center (GBMC).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John C. Greenawalt's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Greenawalt practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Greater Baltimore Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John C. Greenawalt is one of 3,320 internists in Maryland
Internal medicine is Dr. Greenawalt's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Greenawalt is licensed in Maryland.
Specialties and state licenses
- Internal medicine, MarylandPrimary
Internists near Dr. Greenawalt
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John C. Greenawalt billed Medicare for 155 services in 2024
CMS data shows 155 Medicare services from Dr. Greenawalt across 3 procedure codes in 2024, for 76 Medicare patients. Medicare paid $14,098 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Greenawalt's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 212024: 155638%
Dr. Greenawalt compared with the Maryland median for internists, 2024
- Dr. Greenawalt
- Maryland median
- Medicare services
- 155vs 65676% below
- Medicare patients
- 76vs 25170% below
- Part D claims
- 12vs 30996% below
Medians across 3,215 internists in Maryland with Dmand AI profiles that report each measure.
Dr. Greenawalt's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Greenawalt and other internists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John C. Greenawalt treated 76 Medicare patients in 2024, average age 78
CMS counts 76 Medicare patients who saw Dr. Greenawalt in 2024. The largest group is 75 to 84, with 32 patients. 75% of them have arthritis, and 75% have high blood pressure. 18% are also on Medicaid. Their average risk score is 1.82, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Greenawalt's median patient age at 78, with 62% women.
Dr. Greenawalt's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Greenawalt's Medicare patients by sex, 2024
- Women4154%
- Men3546%
Chronic conditions among Dr. Greenawalt's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Mood disorders55%
- Depression50%
- Diabetes50%
- Anxiety45%
- Chronic kidney disease39%
Share of Medicare patients with each condition. A patient can have several.
Dr. Greenawalt's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women62%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John C. Greenawalt wrote 31 Medicare Part D claims in 2024
In 2024, Dr. Greenawalt wrote 31 Medicare Part D claims for 15 patients. 81% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $116 in total drug cost.
Dr. Greenawalt's Part D claims by kind of drug, 2024
- Generic25 claims81%
- Brand-name and other6 claims19%
Dr. Greenawalt's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John C. Greenawalt takes part in Medicare
Dr. Greenawalt accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John C. Greenawalt received $2,925 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Greenawalt from 1 drug or device company in 2021. Consulting fees make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $2,925.
Companies that paid Dr. Greenawalt the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. John C. Greenawalt's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. John C. Greenawalt
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. John C. Greenawalt's NPI number?
Dr. John C. Greenawalt's NPI number is 1699783795. It was assigned on August 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John C. Greenawalt?
Dr. John C. Greenawalt is an internist in Towson, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John C. Greenawalt practice?
Dr. Greenawalt practices at 6701 North Charles Street, Baltimore, MD 21204. Dr. Greenawalt's primary practice is Greater Baltimore Medical Center in Baltimore, Maryland, part of GBMC HealthCare.
What is Dr. John C. Greenawalt's office phone number?
The practice phone on file for Dr. Greenawalt is (443) 849-2000.
What is Dr. John C. Greenawalt's medical license number?
Dr. Greenawalt holds Maryland license D60248.
Which hospitals is Dr. John C. Greenawalt affiliated with?
Dr. Greenawalt practices at Greater Baltimore Medical Center in Baltimore, Maryland.
What medical group is Dr. John C. Greenawalt part of?
Dr. Greenawalt is linked to Greater Baltimore Medical Center (GBMC).
Does Dr. John C. Greenawalt accept Medicare?
Yes. CMS data shows Dr. Greenawalt billed Medicare for 155 services in 2024, and Dr. Greenawalt accepts Medicare assignment.
How many Medicare patients does Dr. John C. Greenawalt see?
CMS counts 76 Medicare patients who saw Dr. Greenawalt in 2024, with an average age of 78.
What services does Dr. John C. Greenawalt bill to Medicare?
In 2024, Dr. Greenawalt's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
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What drugs does Dr. John C. Greenawalt prescribe most?
In 2020 Medicare Part D data, Dr. Greenawalt's most prescribed drugs by claims were Tamsulosin HCl.
Has Dr. John C. Greenawalt received payments from drug or device companies?
CMS Open Payments shows $2,925 in general payments to Dr. Greenawalt from 1 company from 2021 to 2021. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. John C. Greenawalt been practicing?
Dr. Greenawalt graduated from medical school in 2000, 26 years ago.
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